Feeding arrangement for steam-generators.



(LRENARD. FEEDING ARRANGEMENT FOR STEAM GENERATORS.

APPLICATION FILED JUNE 27, 1904. I

2 SHEETS-SHEET 1 Z720ezzbz zarzc 5 Renard I I a "M a A I I THE NORRIS PETERS cm, WASHINGTON, D. c.

PATENTED NOV. '13, .1906.

0. RB'NARD. FEEDING ARRANGEMENT FUR STEAM GENERATORS.

LPPLIOATION FILED JUNE 127.1904.

$20672 207 6 a? Z66 2267a are? UNITED STATES PATENT OFFICE. I

CHARLES RENARD, OF MENDON, FRANCE.

Specification of Letters Patent.

Patented Nov. 13, 1906.

Application filed June 27, 190 2. Serial No. 214,384.

To all whom it may concern:

Be it known that I, CHARLES RENARD, colonel of engineers, a citizen of the French Reublie, residing at Mendon, Seine and Oise, rance, have invented certain new and useful Improvements in Feeding Arrangements for Steam-Generators, of which the following is a specification.

My invention has for its object to provide steam-generators with feeding arrangements which enable the amount of feed-watenair, and liquid or gaseous fuel to be supplied to the generator in a simultaneously-regulated manner.

In the accompanying drawings, Figure 1 is an elevation of a steam-generator provided with a feeding arrangement according to my invention. Fig. 2 shows the same feeding device applied to two steam-generators working simultaneously. Fig. 3 is a section of the motor on a larger scale.

The supply of feed-water, air, and fuel according to my invention is effected by means of a combination of apparatus constituting the feeding device and comprising (a) an auxiliary motor-1, through which the steam from the boiler passes before reaching the main engine which the generator is intended to supply with steam; (b) a fan 2, forcing air into the furnace through a pipe 3 (c) a feedpum 4:, which forces water into the generator t rough a pipe 5 (d) a pump 6, which supplies liquid fuel to the furnace through a pi e 7. (This pump can be replaced by afan w en gaseous fuel isused.) The steam gener ated by the boiler is supplied b a pipe 9 to the aforesaid auxiliary motor 1, mm which it passes by another pipe 10 through the starting-valve 11 to the engine to be driven. The aforesaid two pumps and the fan are operated by the said auxiliary motor 1, and the mechanical connections are so determined that the proportions of air, water, and fuel necessary to insure perfect combustion of the fuel and complete evaporation of the water are obtained, and this result once obtained remains independent of the speed of the auxiliary motor. To each revolution of the auxiliarymotor corresponds the generation of a constant weight of steam of constant quality, (dry or superheated.) The evaporative effect of the generator in a given time is therefore proportional to the speed of the auxiliar motor or normal working speed and is o y limited by the possibilities of speed of the motor and the apparatus operated by it and by the rapid increase of the power absorbed by the feeding apparatus.

The auxiliary motor is in series with the main engine in the current of steam from the generator. This arrangement has the follow: ing advantages: The work required to feed the steam-generator as aforesaid does not practically require an consumption of steam, but only requires a st fall of pressure between the steam-inlet and the steam-outlet of the auxiliary motor. Moreover, in this arrangement the stea1n-generator is dependent upon the main engine, for in order to vary the rate of working of the steam-generator it will suffice to operate the starting-valve 11 of the main engine.

The rate of working depends upon the fall of pressure between the steam-inlet and steam-outlet of the aforesaid auxiliary motor. The ressure of steambeforeit reaches the auxi iary motor is practically constant, as each revolution of the auxiliary motor in jects a given weight of water into the generator, and this constant weight of water is equal to the weight of steam supplied'to the auxiliary motor per revolution. As this motor has an invariable rate of admission, the specific weight of the steam supplied thereto is invariable, so that the admissionpressure is itself practically invariable.

Since the pressure P of the steam before it reaches the auxiliary motor is constant, the pressure p of the steam as it leaves it may be raised by throttling the starting-valve of the main engine more or less, the speed of the auxiliary motor being thereby correspondingly reduced, the opposite effect taking place if the valve of the main engine be opened more fully. It will be seen that the generator (the volume of water in which can be left out of consideration) is thereby made so dependent on the main engine that it works as a generator with a large volume of water su plying constantly and instantaneously ail the steam that can pass through the starting-valve 11 of the main engine without it being necessary to do anything to the generator itself to cause its supply of steam to be proportional to requirements.

Although have described the whole of the steam from the steam-generator as passing through the auxiliary motor, if desired a part of the steam may go direct from the gener- 1 ator to the main engine by opening-more or feeds both auxiliary motors.

less a cock 12 on a by-pass pipe 13, connecting the pipe 9 from the generator to the auxiliary motor with the pipe 10 from the auxiliary motor to the main engine. This causes a fall of all the pressures in the steam-supply pipes and is necessary when the fire is being ighted or when it is desired to work for some considerable time at a low speed.

In order to regulate the quantity of water or of liquid fuel supplied by the aforesaid pumps 4 and 6, diverting-pipes are provided to permit of returning to the feed-water tank 14 and liquid-fuel tank 15, respectively, a part of the liquids delivered by the pumps. These diverting-pipes 16 and 17 run from the aforesaid oil and water pipes 5' and 7 to plugvalves' 18 and 19, which are graduated and provided with an index and dial and are connected to the aforesaid oil and water feed tanks 14 and 15 by coiled pipes 20 and 21 of small bore, the length of which is so calculated that the amount of liquid returned to the feed-tanks does not exceed a certain amount.

By causing a little liquid fuelto flow throug the corresponding diverting-pipe the emission of smoke arisingfrom too great a supply of'li uid fuel is obviated, and by operating the eed-water-diverting pipe the steam is dried or superheated to any required amount.

The apparatus is started as follows: An alcohol-receptacle 22 can be used to supply alcohol to a receptacle below the furnaceburner, the said alcohol being ignited through a hand-hole 23, provided on the side of thegenerator. The auxiliary motor being thrown out of gear, the whole of the feeding apparatus is started by means of a crank 24, which may be similar to those used for starting the motors of automobiles. After the petrol ignites it sets up sufiicient heat to form steam without relying on an auxiliary steam-supply, and the auxiliary motor is then thrown into gear and the generator works automatically. While the fire is being lighted, the steam-diverting pipe must be opened and the very wet steam be allowed to escape directly into the atmosphere or into the condenser.

The extinction of the fire may be uickly effected by shutting off the supply 0 liquid fuel by any suitable means.

The arran ement described for the simu' taneous working generators.

In the arrangement as applied for working two generators, Fig. 2, the pressures between the steam inlets and outlets of the two auxiliary motors are equalized. For this purpose can be adapted of two or more the two steam-pipes 9 from the generators are connected to a collecting-pipe 25, which The same ad'- mlssionressure is thus secured in both of the auxiliary motors. Another collectingpipe 26 connects the steam-outlets of both auxiliary motors, so that the outlet-pressure from both is the same. The fall of pressure is therefore the same for both generators, and this is sufficient to insure that they work under the same conditions.

Automatic safety stop-valves 27 isolate the generators from each other in case of a rupture occurring at any point of the steampipe. Cooks 28 enable this isolation to be obtained by hand when desired.

29 is the startingvalve, controlling the steam from the two generators to the engine to be driven.

Having thus described and ascertained the nature of my invention and in what manner the same may be performed, I declare that what I claim is- 1. Feeding apparatus for steam-generators to enable the amount of feed-water, air and fuel to be supplied to the generator in a simultaneously-regulated manner, consisting, in combination with the generator, of a pumpfor supplying feed-water thereto, means for supplying fuel to the generator, a fan for supplying air to the generator, diverting-pipes for returning a part of th'e feedwater and fuel, an auxiliary motor-for operating the pump, a ipe attached to the auxiliary motor and adhpted to also connect with the main engine, a steam-pipe connecting the auxiliary motor and generator, and a by-pass pipe attached to the steam-pipe between the auxiliary motor and generator and to the pipe extending from the said motor to the main engine.

2. A feedin apparatus for steam-generators of the c ass set forth, comprisin in combination with a generator, an auxi iary motor which is arranged in series with a main engine, a steam-pipe connecting the auxiliary motor and generator, a by-pass pipe attached to the said steam-pipe and adapted to run to the main engine, said by-pass pipe having a controlling cock, and feed water, fuel and air supplying devices operatively connected to the auxiliary motor and generator.

3. A feedin apparatus for steam-generatorsof the c ass set forth, comprising, in combination with a generator, of an auxiliary motor, feed-water, fuel and air supplying devices in operative connection with the motor and generator, feed-water and fuel tanks, the motor being also connected with the generator, diverting-pi a part of the feed-water an fuel, connections between the feed-water and fuel devices and the generator, and coiled pipes of small bore between the feed=water and fuel tanks and the diverting-pipes.

4. A feedm apparatus for steam-generators ofthe c ass set forth, comprising, in combination with a generator, of an auxiliary motorconnected' to the generator, feed water, fuel and air supply'devices operatively es for returning IIO connected to the motor and to the generator, In testimony whereof I have hereunto set diverting-pipes attached to the connections my hand in presence of two subscribing witfor the fuel and feed-water, tanks for holding nesses.

feed-water and fuel, plug-Valves to which CHARLES RENARD.

the diverting-pipes are attached, and coiled Witnesses: pipes of small bore between the plug-valves HANSON G. COKE, and the tanks.

PAUL BLUM. 

